Can You Have an HSA and FSA? Rules & Limits for 2026

To contribute to an HSA, you cannot have any other health coverage that pays for medical expenses that would be covered under your HDHP *before* you meet the plan's minimum deductible. A standard FSA is considered 'other coverage' because it can reimburse you for those exact expenses (like prescriptions or doctor visits) at any time. This rule is in IRS Publication 969 and is non-negotiable.

This is the default FSA most people know. It allows pre-tax contributions of up to $3,400 for 2026 and can be used for a broad list of qualified medical expenses for you, your spouse, and dependents. It typically has a 'use-it-or-lose-it' rule with a possible carryover of up to $680. Its flexibility is what makes it incompatible with HSA contributions.

If you contribute to an HSA while covered by a full-benefit FSA, those HSA contributions are considered 'excess.' You must remove them and pay income tax on the earnings. A 6% excise tax applies each year the excess remains. This creates tax filing complexity and potential penalties, a real pain point for individuals fearing IRS audits.

This FSA is restricted to covering dental and vision expenses only. Since most HSA-eligible HDHPs do not cover these services before the deductible is met, there's no conflict. You can use it for cleanings, fillings, glasses, LASIK, and more. This is the most common and straightforward way for someone to have an HSA and FSA.

This FSA acts like a standard FSA but with a hard trigger: it will not reimburse any expense until you have met the full minimum deductible of your HSA-eligible HDHP ($1,700 for self, $3,400 for family in 2026). This ensures the HDHP's deductible rules are honored. After meeting the deductible, it works normally.

This is a less common FSA available only to former employees after retirement. It is designed to pay for qualified medical expenses in retirement. Since you are no longer an active employee with other group health coverage, it can coexist with an HSA. This is rarely an option for current W2 employees or the self-employed.

For 2026, plan your contributions across both accounts. Max out your HSA first ($4,400 self / $8,750 family) because funds roll over indefinitely and can be invested. Then, decide on your limited FSA amount (up to $3,400). Base the FSA amount on predictable dental and vision costs for the year. Remember, FSA funds are generally forfeited if not used, so be conservative.

Use a specific order when paying medical bills to optimize your accounts. First, use your limited-purpose FSA for all eligible dental and vision expenses until it's exhausted. Second, use your HSA debit card or pay out-of-pocket for other qualified medical expenses. If you pay out-of-pocket, save the receipts to reimburse yourself from the HSA later, allowing the funds more time to grow invested.

At the end of the plan year, use any remaining FSA funds before the grace period or runout deadline ends. Common eligible year-end purchases include prescription sunglasses, extra pairs of glasses, or dental work. If you change jobs or lose HDHP coverage, remember that your HSA remains yours, but your FSA is typically tied to your employment.

If you have family HDHP coverage, your spouse can also have a limited FSA through their employer. However, if your spouse has a full-benefit FSA, it likely disqualifies your family HSA contributions. You must coordinate during open enrollment to ensure all FSAs in the household are the limited type.

Collect your HDHP Summary of Benefits and Coverage (SBC), your FSA plan description, and any enrollment confirmations. Look for explicit language. Does the FSA document say 'limited purpose,' 'dental/vision only,' or 'post-deductible'? Does your HDHP document state it is 'HSA-eligible'?

If your documents are unclear, contact HR. Ask: 'For my FSA, is this a limited-purpose FSA for dental/vision, or a post-deductible FSA? I need to confirm my HSA eligibility.' If you have a full-benefit FSA, ask if a limited-purpose FSA option is available for the next enrollment period.

Based on your research, make the necessary changes. If you want to have an HSA and FSA, elect the limited-purpose or post-deductible FSA option. Set your HSA contribution to your desired amount, keeping in mind the 2026 limits ($4,400/$8,750). Submit your elections before the deadline.

If you are opening a new HSA because you are newly eligible, inform the provider (e.g., Fidelity, Lively) that you have a limited-purpose FSA. They may have specific forms or checkboxes during account setup. If you already have an HSA and are correcting a past mistake, you may need to work with them to remove excess contributions.